Meeting of July 16, 2012 Columbus, Ohio

Transcription

1 NATIONAL BOARD INSPECTION CODE SUBGROUP ON HISTORICAL BOILERS Meeting of July 16, 2012 Columbus, Ohio MINUTES These minutes are subject to approval and are for committee use only. They are not to be duplicated or quoted for other than committee use. The National Board of Boiler & Pressure Vessel Inspectors 1055 Crupper Avenue Columbus, Ohio Phone: (614) Fax: (614)

2 MINUTES OF SUBGROUP ON HISTORICAL BOILERS JULY 16, 2012 COLUMBUS, OHIO 1. Call to Order The Chairman, Robert Reetz called the meeting to order at 10:00 AM on July 16, Announcements a) The National Board would host an outing to the Clippers Baseball game on July 18, Bus transportation from the Crowne Plaza was provided from 5:30PM? PM. b) The National Board would host a continental breakfast on July 19, 2012 from 7 8:00 AM c) The National Board would provide a daily luncheon from 12-1:00 PM 3. Adoption of the Agenda Motion was made to adopt the Agenda as modified. The motion was unanimously adopted. 4. Approval of the Minutes A motion was made to approve the minutes from the previous meeting in January, The motion was unanimously approved. 5. Review of the Roster The attendees, members, alternates and guests are identified on Attachment 1. With the attached attendance listing, a quorum was established. Mr. Larson was excused. 6. Interpretations No Interpretations. 7. Action Items NB Part 3 S SG on Historical Boilers - Resolve conflict of text and figure S A task group of T. Dillon and M. Wahl has been assigned. A report was presented by Mr. Wahl. A motion was made to accept the proposed text and Figure. The motion was unanimously approved. (Attachment 2) NB Part 3 Figure S SG on Historical Boilers -Figure and title are incorrect. Figure should show caulking of seam and rivet heads. The title should reflect caulking of seam and rivet heads also. New drawing will be supplied to committee members by Tom Dillon for review and approval. Mr. Wahl gave a report. A motion was made to accept the proposed text and Figure. The motion was unanimously approved. (Attachment 3) NB Part 2 Supplement 2 SG on Historical Boilers - Limits for Bulged Stayed Firebox Sheets A Task Group consisting of R. Bryce (Chair), D. Cook, D. Rupert and F. Johnson was assigned. Dr. Bryce gave a detailed progress report along with handout. After discussion, the item was sent back to the task group for more work. NB Part 3 S SG on Historical Boilers Revise text and Figure to incorporate the correct percentage of wasting allowed. A Task Group consisting of M. Wahl and T. Dillon was assigned. A detailed report was given by Mr. Wahl. A motion was made to accept the proposed text and Figure. The motion was unanimously approved. (Attachment 4) NB Part 3 Supplement 2 SG on Historical Boilers Review NDE requirements of stayed areas. A Task Group consisting of M. Wahl (Chair), J. Larson and F. Johnson was assigned. A progress report was given by Mr. Wahl. NB Part 2 S2 SG on Historical Boilers This section should be revised to provide chart(s) and formula(s)for calculating maximum allowable working pressure for cylindrical components under external pressure. A Task Group of Tom Dillard and Steve Torkildson was assigned. Mr. Reetz made a motion to close this item with no action taken since the required information is available in PFT-14 of ASME Section I, 1971 Edition. The motion was unanimously approved.

3 7 Action Items (Continued) NB Part 2 S2.6.2 b) SG on Historical Boilers This section should be revised to provide more guidance for evaluating local pitting corrosion versus general corrosion. A progress report was given by Mr. Wahl. NB Part 2 S2 Table S This chart contains errors in formula and nomenclature and should be revised. A Task Group of R. Reetz, F. Johnson and R. Bryce was assigned. Dr. Bryce gave a detailed progress report along with handout. A motion was made to accept the proposed text and Charts. The motion was unanimously approved. (Attachment 5) NB Part 2 S SG on Historical Boilers Define deteriorated rivet heads. A Task Group consisting of Dr. Bryce and Dennis Ruppert was assigned. Dr. Bryce gave a report. A motion was made to accept the proposed text and Figure. The motion was unanimously approved. (Attachment 6) NB Part 2 S SG on Historical Boilers Review requirements for stayed areas. A task group of D. Cook, T. Dillon, and R. Bryce was assigned. A progress report was given by Dr. Bryce. 8. New Business NB Part 3 SG on Historical Boilers Correct errors and omissions to Part 3 S , S S and S The corrections were presented by Mr. Wahl. A motion was made to accept the corrections. The motion was unanimously approved. (Attachment 7) 9. Future Meetings January 2013 Mobile, AL July 2013 Columbus, Ohio 10. Adjournment The meeting was adjourned at 4:30 pm on July 16, Respectfully Submitted, Bill Smith Secretary, Subgroup on Historical Boilers Attachment 1- Attendance Roster Attachment 2- NB Attachment 3- NB Attachment 4- NB Attachment 5- NB Attachment 6- NB Attachment 7- NB

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6 Attachment 2 NB Subject: 2007 Edition, Part 3, Supplement 2, S Welded Repair of Cracks in Unstayed Area File Number: NB Prop. Page: 156 & 157 Proposal: Explanation Update figure S to show crack in non-riveted area, update text to fix a typo, move See figure S and change girth to circumferential. This area currently is confusing and can be updated and corrected to fix these issues. There are six issues to address. 1. Remove See figure S from a). 2. Correct Typo in b) should say Cracks in unstayed not Cracks in stayed 3. Change 8 requirement to insure that the repair is at least 2 from last row of rivets and that preheat is used. Text should be changed to within 2in. (50mm) from the center line of the outer most row of rivets. Minimum 175 degree preheat shall be used. 4. Add a reference to figure S a in c). 5. Add a reference to figure S b in d). 6. Change girth to circumferential in d) 7. Use new figure S a and S b Update text and diagram can be found on page 3 1

7 Item # 2 Change to UNSTAYED Item # 1 Remove text from here Attachment 2 Item # 3 Change text for 8 rule and preheat Item # 4 Add Reference to Figure (See Figure S b) (See Figure S a) Item # 5 Add Reference to Figure Item # 6 Change girth to Circumferential Item # 7 Replace this with the Figure S a and Figure S b on page 3 2

8 Attachment 2 Updated text and Diagram S WELDED REPAIR OF CRACKS IN UNSTAYED AREAS a) Prior to repairing cracks, the plate shall be NDE examined for other defects. All affected sections shall be repaired. b) Cracks in unstayed areas may be repaired by welding. Before cracks are repaired, however, the inner surface of the plate should be examined for possible excessive corrosion or grooving. c) Cracks in unstayed areas may be repaired by welding, providing the cracks do not extend between rivet holes in a longitudinal seam or parallel to a longitudinal seam within 2in. (50mm) from the center line of the outer most row of rivets. Minimum 175 degree preheat shall be used. The complete repair must be radiographed and stress relieved. Alternative methods in lieu of Postweld Heat Treatment identified in NBIC Part 3, may be used. (See NBIC Part 3, Figure S a) d) Cracks radiating from a common point (star cracking) shall not be repaired; installation of a flush patch is required. Cracks radiating from a rivet hole in a circumferential seam may be repaired if the plate is not seriously damaged. (See NBIC Part 3, Figure S b) e) Prior to welding, the rivets into which cracks intend and the rivets on each side of them shall be removed. f) In riveted joints, tack bolts should be placed in alternating holes to hold plate laps firmly. g) Rivets holes should be reamed after welding. h) Welding shall not cover rivet heads. Figure S a Unstayed Area Crack Repair Figure S b Unstayed Area Crack Repair Cracks Acceptable to Repair by Welding Cracks Unacceptable to Repair by Welding 3

9 Attachment 3 NB Subject: 2007 Edition, Part 3, Supplement 2, S Caulking Rivet Seams and Rivet Heads File Number: NB Prop. Page: 166 & 167 Proposal: Update figure S with proper title and update figure to show caulking rivet seams. Explanation: 1. Update a) to say caulking tool instead of impact tool. 2. Current title calls out Rivet heads; however, figure shows caulking rivet seam. Figure title should be caulking rivet seams and show caulking rivet seams. Update Text & figure can be found on page 3 1

10 Attachment 3 Item #1 Change to caulking tool Item #2 Replace this figure with the one update one on page 3 2

11 Attachment 3 S Caulking Riveted Seams and Rivet Heads a) Caulking refers to the sealing of plate seams and rivet heads by driving the edge of one surface onto the other by use of a caulking tool. S Caulking Rivet Seams Plate Edge Bevel 70 Degrees Max Caulking Rivet Seam Caulking Tool 3

12 Attachment 4 NB Subject: 2007 Edition, Part 3, Supplement 2, S Weld Buildup of Wastage and Grooving in Unstayed Areas File Number: NB Prop. Page: 155 & 156 Proposal: Clarify the 60% minimum required thickness. Explanation: An area of 3 square inches has been added to allow for the buildup of pits and grooving in smaller area s where the thickness is less than the 60% of minimum required. 1. Add in an area exceeding 3 sq. in. (1,950 sq. mm). to a) 2. Add and have an area exceeding 3 sq. in. (1,950 sq. mm) to b) 3. Update figure S Update text and diagram can be found on page 3 1

13 Item #1 Add the text below: in an area exceeding 3 sq. in. (1,950 sq. mm). Attachment 4 Item #2 Add the text below: and have an area exceeding 3 sq. in. (1,950 sq. mm). Item # 3 Replace this with the Figure S on page 3 2

14 Attachment 4 S Weld Buildup of Wastage and Grooving in Unstayed Areas a) Weld buildup shall not be used if the affected section of plate has wasted below 60% of the minimum required thickness per Part 2, Supplement 2 in an area exceeding 3 sq. in. (1,950 sq. mm). (See NBIC Part 3, Figure S ) b) Wasted sections that have wasted below 60% of the minimum required thickness and have an area exceeding 3 sq. in. (1,950 sq. mm), shall be repaired by installing a flush patch using full penetration welds. c) Weld buildup of wasted areas shall not exceed 100 sq. in. (65,000 sq. mm). d) Weld buildup is to replace material that has been lost due to wastage and grooving, and is not to replace thickness on the opposite side of the sheet. Weld buildup must be applied to the side of the sheet that is wasted or grooved. e) Prior to welding, the rivets in the wasted area should be removed. f) Rivets holes should be reamed after welding. g) Welding shall not cover rivet heads. Figure S Weld Buildup 3

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33 Attachment 7 NB Subject: 2007 Edition, Part 3, Supplement 2, S Weld Buildup of Wastage and Grooving in Stayed Areas File Number: NB Prop. Page: 159 & 160 Proposal: Explanation Update text to clarify additional requirements, fix 2 typo s and removes a reference that is incorrect. This area currently is confusing and can be updated and corrected to fix these issues. There are four issues to address. 1. Remove welding shall not cover rivet or stay bolt heads due to redundancy with c) 2. Add the following text at the end of the requirement statement match the others in S & S apply with the following additional requirements identified below. 3. Remove typo ;and 4. Remove d) completely. Figure has no reference to weld buildup. The figure is for Part 3, supplement 2, S and is referenced there. Update text can be found on page 3 1

34 Attachment 7 Item # 2 apply with the following additional requirements identified below. Item # 1 Remove text Item # 3 Remove text Item # 4 Remove text 2

35 Attachment 7 Updated text and Diagram S Weld Buildup of Wastage and Grooving in Stayed Areas Requirements specified in NBIC Part 3, S shall apply with the following additional requirements identified below. a) Prior to welding the rivets and or staybolts in the wasted areas should be removed. b) Threaded staybolt holes shall be retapped after welding. c) Welding shall not cover rivet or staybolt heads. 3

36 Attachment 7-1 NB Subject: 2007 Edition, Part 3, Supplement 2, S Weld Repair of Cracks in Stayed Area s File Number: NB Prop. Page: 159 Proposal: Explanation Update text to clarify additional requirements, fix 2 typo s and removes a reference that is incorrect. This area currently is confusing and can be updated and corrected to fix these issues. There are four issues to address. 1. Remove b) c) and d) due to redundancy with requirements in Add a new b) that states Threaded staybolt holes shall be retapped after welding. Update text can be found on page 3 1

37 Item # 1 Attachment 7-1 Remove text for b) c) & d) Item #2 Add Text b) Threaded staybolt holes shall be retapped after welding. 2

38 Attachment 7-1 Updated text and Diagram S Weld Repair of Cracks in Stayed Area s Requirements specified in NBIC Part 3, S shall apply with the following additional requirement identified below. a) If the crack extends into a staybolt hole, the staybolt shall be removed prior to make the repair. b) Threaded staybolt holes shall be retapped after welding. 3

39 Attachment 7-2 NB Subject: 2007 Edition, Part 2, Supplement 2, S Repair of Stayed Firebox Sheets Grooved or Wasted at the Mudring File Number: NB Prop. Page: 161 Proposal: Change the wording in providing more guidance for evaluating local pitting corrosion versus general corrosion. Explanation: Clarify the 60% minimum required thickness and make the description the same in all area s that figure S reference. 1. Change text in b) to include the area exceeding 3 sq. in. (1,950 sq. mm). Text would state For mudrings of the locomotive style (See NBIC Part 3, Figure S ), weld buildup shall not be used if the affected section of plate has wasted below 60% of the minimum required thickness per Part 2, Supplement 2 in an area exceeding 3 sq. in. (1,950 sq. mm). (See NBIC Part 3, Figure S ) Repair by weld buildup cannot be used if the wastage extends below the waterside surface of the mudring or if the strength of the structure will be impaired. If extensive welding is required, the affected area shall be removed and replaced with a flush patch. 2. Change text in c) to state Wasted sections that have wasted below 60% of the minimum required thickness and have an area exceeding 3 sq. in. (1,950 sq. mm) shall be repaired by installing a flush patch using full penetration welds. Update text can be found on page 3 1

40 Item #1 Update Text Attachment 7-2 Item #2 Update Text 2

41 Attachment 7-2 S REPAIR OF STAYED FIREBOX SHEETS GROOVED OR WASTED AT THE MUDRING b) For mudrings of the locomotive style (See NBIC Part 3, Figure S ), weld buildup shall not be used if the affected section of plate has wasted below 60% of the minimum required thickness per Part 2, Supplement 2 in an area exceeding 3 sq. in. (1,950 sq. mm). (See NBIC Part 3, Figure S ) Repair by weld buildup cannot be used if the wastage extends below the waterside surface of the mudring or if the strength of the structure will be impaired. If extensive welding is required, the affected area shall be removed and replaced with a flush patch. c) Wasted sections that have wasted below 60% of the minimum required thickness and have an area exceeding 3 sq. in. (1,950 sq. mm) shall be repaired by installing a flush patch using full penetration welds. 3

42 Attachment 7-3 NB Subject: 2007 Edition, Part 3, Supplement 2, S Repair of Handhole Openings File Number: NB Prop. Page: 170 & 171 Proposal: Explanation: Change the wording in providing more guidance for evaluating local pitting corrosion versus general corrosion. Clarify the 60% minimum required thickness and make the description the same in all area s that figure S reference. 1. Add in an area exceeding 3 sq. in. (1,950 sq. mm). to a) 2. Move Text Weld buildup of wasted areas shall not exceed 100 sq. in. (65,000 sq. mm). to item d) to match other area s of the NBIC repair section. 3. Add and have an area exceeding 3 sq. in. (1,950 sq. mm) to c) Update text and diagram can be found on page 3 1

43 Item #1 Add the text below: Attachment 7-3 in an area exceeding 3 sq. in. (1,950 sq. mm). Item #2 Move circle text to new item d) Item #3 Add the text below: and have an area exceeding 3 sq. in. (1,950 sq. mm). 2

44 Attachment 7-3 S Repair of Handhole Openings a) Weld buildup shall not be used if the affected section of plate has wasted below 60% of the minimum required thickness per Part 2, Supplement 2 in an area exceeding 3 sq. in. (1,950 sq. mm). (See NBIC Part 3, Figure S ) b) Weld buildup is to replace material that has been lost due to wastage and grooving, and is not to replace thickness on the opposite side of the sheet. Weld buildup must be applied to the side of eth sheet that is wasted or grooved. c) Wasted sections that have wasted below 60% of the minimum required thickness and have an area exceeding 3 sq. in. (1,950 sq. mm), shall be repaired by installing a flush patch using full penetration welds. d) Weld buildup of wasted areas shall not exceed 100 sq. in. (65,000 sq. mm). 3